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Finding the Fourth Proportional to 992.74, 1,488.56 and 407.42

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Solution

The fourth proportional to 992.74, 1,488.56 and 407.42 is: 610.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.74 : 1,488.56 = 407.42 : x
  2. Step 2: Convert to fraction form
    992.74/1,488.56 = 407.42/x
  3. Step 3: Cross multiply
    992.74x = 1,488.56 × 407.42
  4. Step 4: Simplify right side
    992.74x = 606,469.12
  5. Step 5: Solve for x
    x = 606,469.12/992.74
  6. Step 6: Final answer
    x = 610.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.